Question

In a diffraction(single slit experiment), the slit is exposed by white light. The fringe surrounding the central fringe is

• A. Red
• B. Yellow
• C. Violet
• D. Green

Answer 1

Answer: (C)

Violet

From the condition, $a\sin \theta =n\lambda$
the cental spot is bright since $n=0$ and it is satisfied for all wavelengths.
The next angle will be for ${\lambda }_{violet}$
Red will have the maximum angle.